qw modifier

HCPCS code G0431-QW will be deleted?


CMS is updating the status of two codes on the Clinical Laboratory Fee Schedule (CLFS).

Effective immediately, code G0431QW is deleted from the CLFS. Code G0431 describes a high complexity test, and should not be reported with a QW modifier; the QW modifier indicates a CLIA waived test.


Effective immediately, code G0434QW is added to the CLFS. Code G0434 can describe a CLIA waived test. The use of the QW modifier to indicate a CLIA waived test is necessary for accurate claims processing.

Codes G0431 and G0434 will remain on the CLFS.

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